Folks, a friendly reminder that Neem is an insecticide. Yes, it is derived from natural ingredients, as many insecticides are, but it is an insecticide, an effective one, and it kills many insects, including butterflies.
Neem is great for killing a variety of soft-bodied insects through a variety of mechanisms (they can no longer reproduce, they cannot eat, they cannot molt, etc.). The same features that make it great for things like controlling coddling moths on fruit trees will make it great at killing Monarch butterflies, Swallowtail butterflies, Luna moths, and the like.
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